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Date:   Fri, 22 Mar 2019 09:31:53 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Thierry Reding <treding@...dia.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Johan Hovold <johan@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] ARM: dts: imx50: Add Kobo Aura DTS

On Tue, Mar 19, 2019 at 04:24:17PM +0100, Jonathan Neuschäfer wrote:
> The Kobo Aura is an e-book reader released in 2013.
> 
> With the devicetree in its current state, the kernel will boot and run
> for about ten seconds. To solve this, the embedded controller needs to
> be told that the system should stay powered on. This will be done in a
> later patchset.
> 
> - The IOMUXC mode bits for the SD interfaces were taken from the
>   vendor's U-Boot fork.
> - The bus width of the eMMC is 4 bits in the vendor kernel, but I
>   achieved better performance with 8 bits.
> - The SDIO clock frequency for the WiFi chip is 25MHz in the vendor
>   kernel, but the WiFi chip (BCM43362) supports 50MHz, which works
>   reliably on this board and gives slightly better performance.
> - The I2C pins' IOMUXC settings come from the vendor's U-Boot fork.
> 
> Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
> ---
>  arch/arm/boot/dts/Makefile            |   3 +-
>  arch/arm/boot/dts/imx50-kobo-aura.dts | 245 ++++++++++++++++++++++++++
>  2 files changed, 247 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/boot/dts/imx50-kobo-aura.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index f4f5aeaf3298..0c85156c552b 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -363,7 +363,8 @@ dtb-$(CONFIG_SOC_IMX35) += \
>  	imx35-eukrea-mbimxsd35-baseboard.dtb \
>  	imx35-pdk.dtb
>  dtb-$(CONFIG_SOC_IMX50) += \
> -	imx50-evk.dtb
> +	imx50-evk.dtb \
> +	imx50-kobo-aura.dtb
>  dtb-$(CONFIG_SOC_IMX51) += \
>  	imx51-apf51.dtb \
>  	imx51-apf51dev.dtb \
> diff --git a/arch/arm/boot/dts/imx50-kobo-aura.dts b/arch/arm/boot/dts/imx50-kobo-aura.dts
> new file mode 100644
> index 000000000000..e778a677c752
> --- /dev/null
> +++ b/arch/arm/boot/dts/imx50-kobo-aura.dts
> @@ -0,0 +1,245 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +// Copyright 2019 Jonathan Neuschäfer
> +//
> +// The Kobo Aura e-book reader, model N514. The mainboard is marked as E606F0B.
> +
> +/dts-v1/;
> +#include "imx50.dtsi"
> +#include <dt-bindings/input/input.h>
> +
> +/ {
> +	model = "Kobo Aura (N514)";
> +	compatible = "kobo,aura", "fsl,imx50";

Board compatible should also be documented.

> +
> +	chosen {
> +		stdout-path = "serial1:115200n8";
> +	};
> +
> +	memory@...00000 {
> +		device_type = "memory";
> +		reg = <0x70000000 0x10000000>;
> +	};
> +
> +	gpio-leds {
> +		compatible = "gpio-leds";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_leds>;
> +
> +		on {
> +			label = "kobo_aura:orange:on";
> +			gpios = <&gpio6 24 GPIO_ACTIVE_LOW>;
> +			panic-indicator;
> +		};
> +	};
> +
> +	gpio-keys {
> +		compatible = "gpio-keys";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_gpiokeys>;
> +
> +		power {
> +			label = "Power Button";
> +			gpios = <&gpio4 10 GPIO_ACTIVE_LOW>;
> +			linux,code = <KEY_POWER>;
> +		};
> +
> +		hallsensor {
> +			label = "Hallsensor";
> +			gpios = <&gpio5 15 GPIO_ACTIVE_LOW>;
> +			linux,code = <0>;

Use define KEY_RESERVED?

> +			linux,input-type = <5>;

Use define EV_SW?

> +		};
> +
> +		frontlight {
> +			label = "Frontlight";
> +			gpios = <&gpio4 1 GPIO_ACTIVE_LOW>;
> +			linux,code = <KEY_DISPLAYTOGGLE>;
> +		};
> +	};
> +
> +	sd2_pwrseq: pwrseq {
> +		compatible = "mmc-pwrseq-simple";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_sd2_reset>;
> +

Please do not have random newlines.

> +		reset-gpios = <&gpio4 17 GPIO_ACTIVE_LOW>;
> +	};
> +
> +	sd2_vmmc: gpio-regulator {
> +		compatible = "regulator-gpio";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_sd2_vmmc>;
> +
> +		regulator-name = "vmmc";
> +		states = <3300000 0>;
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		enable-gpio = <&gpio4 12 GPIO_ACTIVE_LOW>;
> +		startup-delay-us = <100000>;
> +	};
> +};
> +
> +&iomuxc {
> +	pinctrl_uart2: uart2 {
> +		fsl,pins = <
> +			MX50_PAD_UART2_TXD__UART2_TXD_MUX	0x1e4
> +			MX50_PAD_UART2_RXD__UART2_RXD_MUX	0x1e4
> +		>;
> +	};
> +
> +	pinctrl_i2c1: i2c1 {

Please sort these pinctrl nodes alphabetically.

> +		fsl,pins = <
> +			MX50_PAD_I2C1_SCL__I2C1_SCL		0x400001fd
> +			MX50_PAD_I2C1_SDA__I2C1_SDA		0x400001fd
> +		>;
> +	};
> +
> +	pinctrl_i2c2: i2c2 {
> +		fsl,pins = <
> +			MX50_PAD_I2C2_SCL__I2C2_SCL		0x400001fd
> +			MX50_PAD_I2C2_SDA__I2C2_SDA		0x400001fd
> +		>;
> +	};
> +
> +	pinctrl_i2c3: i2c3 {
> +		fsl,pins = <
> +			MX50_PAD_I2C3_SCL__I2C3_SCL		0x400001fd
> +			MX50_PAD_I2C3_SDA__I2C3_SDA		0x400001fd
> +		>;
> +	};
> +
> +	pinctrl_leds: leds {
> +		fsl,pins = <
> +			MX50_PAD_PWM1__GPIO6_24			0x0
> +		>;
> +	};
> +
> +	pinctrl_gpiokeys: gpiokeys {
> +		fsl,pins = <
> +			MX50_PAD_CSPI_MISO__GPIO4_10		0x0
> +			MX50_PAD_SD2_D7__GPIO5_15		0x0
> +			MX50_PAD_KEY_ROW0__GPIO4_1		0x0
> +		>;
> +	};
> +
> +	pinctrl_sd1: sd1 {
> +		fsl,pins = <
> +			MX50_PAD_SD1_CMD__ESDHC1_CMD		0x1e4
> +			MX50_PAD_SD1_CLK__ESDHC1_CLK		0xd4
> +			MX50_PAD_SD1_D0__ESDHC1_DAT0		0x1d4
> +			MX50_PAD_SD1_D1__ESDHC1_DAT1		0x1d4
> +			MX50_PAD_SD1_D2__ESDHC1_DAT2		0x1d4
> +			MX50_PAD_SD1_D3__ESDHC1_DAT3		0x1d4
> +
> +			MX50_PAD_SD2_CD__GPIO5_17		0x0
> +		>;
> +	};
> +
> +	pinctrl_sd2: sd2 {
> +		fsl,pins = <
> +			MX50_PAD_SD2_CMD__ESDHC2_CMD		0x1e4
> +			MX50_PAD_SD2_CLK__ESDHC2_CLK		0xd4
> +			MX50_PAD_SD2_D0__ESDHC2_DAT0		0x1d4
> +			MX50_PAD_SD2_D1__ESDHC2_DAT1		0x1d4
> +			MX50_PAD_SD2_D2__ESDHC2_DAT2		0x1d4
> +			MX50_PAD_SD2_D3__ESDHC2_DAT3		0x1d4
> +		>;
> +	};
> +
> +	pinctrl_sd2_reset: sd2-reset {
> +		fsl,pins = <
> +			MX50_PAD_ECSPI2_MOSI__GPIO4_17		0x0
> +		>;
> +	};
> +
> +	pinctrl_sd2_vmmc: sd2-vmmc {
> +		fsl,pins = <
> +			MX50_PAD_ECSPI1_SCLK__GPIO4_12		0x0
> +		>;
> +	};
> +
> +	pinctrl_sd3: sd3 {
> +		fsl,pins = <
> +			MX50_PAD_SD3_CMD__ESDHC3_CMD		0x1e4
> +			MX50_PAD_SD3_CLK__ESDHC3_CLK		0xd4
> +			MX50_PAD_SD3_D0__ESDHC3_DAT0		0x1d4
> +			MX50_PAD_SD3_D1__ESDHC3_DAT1		0x1d4
> +			MX50_PAD_SD3_D2__ESDHC3_DAT2		0x1d4
> +			MX50_PAD_SD3_D3__ESDHC3_DAT3		0x1d4
> +			MX50_PAD_SD3_D4__ESDHC3_DAT4		0x1d4
> +			MX50_PAD_SD3_D5__ESDHC3_DAT5		0x1d4
> +			MX50_PAD_SD3_D6__ESDHC3_DAT6		0x1d4
> +			MX50_PAD_SD3_D7__ESDHC3_DAT7		0x1d4
> +		>;
> +	};
> +};
> +
> +&uart2 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_uart2>;
> +	status = "okay";
> +};
> +
> +&i2c1 {

Please sort these labeled nodes alphabetically.

> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_i2c1>;
> +	status = "okay";
> +
> +	/* TODO: ektf2132 touch controller at 0x15 */
> +};
> +
> +&i2c2 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_i2c2>;
> +	status = "okay";
> +
> +	/* TODO: TPS65185 PMIC for E Ink at 0x68 */
> +};
> +
> +&i2c3 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_i2c3>;
> +	status = "okay";
> +
> +	/* TODO: embedded controller at 0x43 */
> +};
> +
> +&esdhc1 {
> +	status = "okay";

We usually end property list with 'status'.

Shawn

> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_sd1>;
> +
> +	max-frequency = <50000000>;
> +	bus-width = <4>;
> +	cd-gpios = <&gpio5 17 GPIO_ACTIVE_LOW>;
> +	disable-wp;
> +
> +	/* External µSD card */
> +};
> +
> +&esdhc2 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_sd2>;
> +
> +	bus-width = <4>;
> +	max-frequency = <50000000>;
> +	disable-wp;
> +	mmc-pwrseq = <&sd2_pwrseq>;
> +	vmmc-supply = <&sd2_vmmc>;
> +
> +	/* CyberTan WC121 SDIO WiFi (BCM43362) */
> +};
> +
> +&esdhc3 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_sd3>;
> +
> +	bus-width = <8>;
> +	non-removable;
> +	max-frequency = <50000000>;
> +	disable-wp;
> +
> +	/* Internal eMMC */
> +};
> --
> 2.20.1
> 

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